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Old 10-24-2011, 10:03 AM   #1
Camposupt
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Default MCI 350 engine has gas & spark but will not run

I am fairly new to the forum and to working on EZGO engines. I have searched for an answer in previous posts but have missed it if there is one. I at least know that if a problem has an answer that the extremely knowledgeable folks on this forum will have it.

I have a 350 MCI engine in a custom built "Model T". It just quit running and I have not been able to find the problem. The fuel pump is working well. I put a new carb on. I replaced the spark plugs. I have checked the valve gaps and they are all at 007 on a cold engine. I know they are supposed to be 004 on a warm engine but since it will not run..... I have 110 lbs of compression on one cylinder but only 60 lbs on the other. I would like to check/set the timing. I can not get the timing belt cover off due to its proximity to the crankshaft pulley. It looks like I would have to take the clutch off to get to the pulley and because of the engine placement that means I will have to pull the engine.

So.... I have two questions (maybe more), Has anyone had a similar problem (not running with both spark and gas and one cylinder low on compression) and has a simple or simi-simple solution and can I get the #&%*! cover off without having to take off the clutch?
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Old 10-24-2011, 11:27 AM   #2
ezgomike
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Default Re: MCI 350 engine has gas & spark but will not run

Both cyls are low on compression.

140-160 is good compression.

Time to replace your valves. It's likely your rockers are hitting the valve spring retainers, and the valves cannot close.
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Old 10-24-2011, 12:26 PM   #3
Dave Box
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Default Re: MCI 350 engine has gas & spark but will not run

Pour a little engine oil into each cylinder and retake the compression test. If the compression increases you have worn cylinders / rings. If it does not increase you have worn valves.

Before you tear into the engine have pulled a plug and actually seen it sparking outside the engine?

Dave

Last edited by Dave Box; 10-24-2011 at 12:26 PM.. Reason: sp
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Old 10-24-2011, 09:52 PM   #4
Camposupt
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Default Re: MCI 350 engine has gas & spark but will not run

I have pulled the plug. Grounded it and had good spark. I will see if a little oil in the cylinders improves the compression but the engine is pretty new and doesn't have much time on it at all.
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Old 10-25-2011, 02:17 AM   #5
worqhors
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Default Re: MCI 350 engine has gas & spark but will not run

Squirt fuel or carb cleaner into carb opening. If it fires and runs for a couple of seconds, fuel may not be reaching your carb. A very low compression cannot activate the diaphragm of your fuel pump. Hence, no pumping action. Raise your compression, as suggested to at least 120.
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Old 10-25-2011, 08:38 AM   #6
Camposupt
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Default Re: MCI 350 engine has gas & spark but will not run

I'm going to check the compression again today. I have already tried starting ether which didn't work. The fuel pump is working, really shoots the gas out. If I let the engine turn over for a period the spark plugs will come out wet so I'm pretty sure I'm getting gas to the combustion chamber.
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Old 10-25-2011, 04:12 PM   #7
worqhors
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Default Re: MCI 350 engine has gas & spark but will not run

I had a similar problem once. I discovered the solution by accident. When I removed the fuel line connection to the carb and then stepped on the gas, the engine run. I had too much fuel in the carb bowl. I simply adjusted the float level.
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Old 10-26-2011, 08:06 AM   #8
Camposupt
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Default Re: MCI 350 engine has gas & spark but will not run

Thanks worqhors. I will check that as well. It would mean that the old carb and the new one I just put on would have the same problem but stranger things have happened.

To all: I have had a slight emergency that is delaying me from getting back on the "T". I should be able to get back on the problem before the week is out. I appreciate the responses received and ones to come.
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